ITER Council milestone #50 successfully achieved . WELL DONE to ALL

March 30 th  2020

Passing an ITER Council milestone is always an achievement. Passing this milestone at this moment is much more than that: it is a demonstration that, despite the constraints imposed by the public health context, the ITER Organization, the European Domestic Agency and their contractors are determined to keep moving forward and to remain on schedule.

ITER Council milestone #50, which was successfully achieved two days ahead of schedule late on 28 March, is of considerable significance for the project, as it opens the way for the launch of the machine assembly phase.

The milestone consisted in demonstrating that the heavy lift cranes could successfully travel between the Assembly Hall and the Tokamak Building in order to deliver components to the Tokamak pit.

Three actions were required: first, the completion of the crane hall structure; second, the removal of the temporary wall separating the buildings; and finally, the verification of the overhead crane load path in the Tokamak Building.

The last operation, both spectacular and delicate, required validating the full 170-metre-long runway of the double bridge crane—from the entrance of the Assembly Hall, all the way to the opposite end of the newly created crane hall and back.

It was a display of Titans, with no less than 1,000 tonnes of steel and concrete test loads attached to the giant hoists of the bridge crane.

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Initiated at 8:00 a.m., the operation lasted well into the night and was only considered completed when the crane and its loads had returned to the Assembly Hall and were secured.
By then Saturday had turned into Sunday, but 31 March—the official target for ITER Council milestone #50*—was still 48 hours away.

The crane and its loads moved slowly, taking long pauses at strategic locations: at the “seismic link” between the two buildings, at the threshold of the Tokamak Building, over the protruding lid of the Assembly Pit …

All the while, metrology systems were monitoring the deflections that the loads were causing to the runway beams and steel pillars—essential information for validating the crane hall’s structure and achieving the milestone.

With the temporary wall between the Assembly Hall and Tokamak Building removed, one could take in, for the first time, the full theatre of future assembly operations—a huge open space that even dwarfs the 20-metre-high vacuum vessel sector sub-assembly tools.

It was an awesome view that conveyed the unique size, complexity and beauty of ITER.

 

WELL DONE TO ALL IN THIS VERY DIFFICULT TIME

 

 

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